RFR: Merge jdk17

[Jesper Wilhelmsson]

Forwardport JDK 17 -> JDK 18

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Commit messages:
 - Merge
 - 8266347: assert(Dependencies::is_concrete_root_method(fm, ctxk) == Dependencies::is_concrete_method(m, ctxk)) failed: mismatch
 - 8264066: Enhance compiler validation
 - 8265201: JarFile.getInputStream not validating invalid signed jars
 - 8258432: Improve File Transfers
 - 8264079: Improve abstractions
 - 8262380: Enhance XML processing passes
 - 8262967: Improve Zip file support
 - 8264460: Improve NTLM support
 - 8256491: Better HTTP transport
 - ... and 10 more: https://git.openjdk.java.net/jdk/compare/0790f04d...025eaefb

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.java.net/?repo=jdk&pr=4863&range=00.0
 - jdk17: https://webrevs.openjdk.java.net/?repo=jdk&pr=4863&range=00.1

Changes: https://git.openjdk.java.net/jdk/pull/4863/files
  Stats: 517 lines in 33 files changed: 403 ins; 34 del; 80 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4863.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4863/head:pull/4863

PR: https://git.openjdk.java.net/jdk/pull/4863